With this universal drilling template, you finally have a perfect tool to help you, especially with older trainmodels, to precisely and professionally make thenecessary drilling for a loudspeaker installation. This high quality stainless steel product can be fixated with the provided screw-set to the preferred spot. You can now precisely drill the fitting symmetric 4mm holes.The 4 wings with their smaller 2.5mm holes exactly match the required diameter for the installations crews of corresponding loudspeakers on the right spot. For very narrow spaces, the wings are prepared with a rated break point for easy removal if necessary. (Tools required, Caution, sharp edges!)